电磁阀换向阀大体可分为先导式电磁换向阀和直动式电磁换向阀两大类，而先导式又简称多次(两次以上)开阀，直动式简称一次性开阀。
简单为你介绍：1、先导式：通电时，电磁力把先导孔打开，上腔室压力迅速下降，在关闭 件周围形成上低下高的压差，流体压力推动关闭件向上移动，阀门打开；断 电时，弹簧力把先导孔关闭，入口压力通过旁通孔迅速腔室在关阀件周围形 成下低上高的压差，流体压力推动关闭件向下移动，关闭阀门。
2、直动式：通电时，电磁线圈产生电磁力把关闭件从阀座上提起，阀门打 开；断电时，电磁力消失，弹簧把关闭件压在阀座上，阀门关闭。 简略： 先导式电磁阀需要以工作介质的压力支撑做为开阀的第2条件。直动式则仅 依靠电磁力进行工作。
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